includeは返り値を取る

http://p0t.jp/mt/archives/2006/12/includer.htmlは目から鱗。へぇ〜！
ということは、これもできるか？

$ ls
foo.php
$ php -r 'if (@include "foo.php") echo "included\n"; else echo "not found\n";'
included
$ rm foo.php
$ php -r 'if (@include "foo.php") echo "included\n"; else echo "not found\n";'
not found
$

おおっ！